Crankshaft grinder



M. STILES CRANKSHAFT GRINDER March 2, 1954 2 Sheets-Sheet 2 Filed NOV. 7, 1952 l9 2/ 20 I 40 Z2 FIG-5 Marv/n Stiles INVENTOR.

FIG-4 FIG-'6 dam-neg position on a crank throw;

Patented Mar. 2, 1 954 UNITED TATES PATENT OFFICE Mervin Stiles, Spokane, Wash.

Application November 7, 1952, Serial No. 319,268

1 This invention relates to crankshaft grinders and particularly to those of the type used for regrinding th throws of an engine crankshaft while the crankshaft is located inthe engine block.

One object of the invention lies in the provision of a crankshaft grinder which may be used in a wide variety of engines, particularly diesel engines of the V-type, without requiring removal of the crankshaft from the block.

Another object of the invention lies in the provision of a crankshaft grinder which may be readily adapted to grind the crankshaft throws without requiring removal of the engine block from the vehicle.

Another object of the invention lies in the provision of a crankshaft grinder which may be supported from a portion of the throw to be ground, and thus will require a limited amount of space to perform the grinding operation.

Another object of the invention lies in the provision of a crankshaft grinder in which accurate positioning of the grinding wheel face with respect to the crank throw may be obtained more easily and with less expense.

Another object of the invention lies in the provision of a spring biased grinding face which will permit the grinding wheel to traverse a path commensurate with the circumferential face of the throw and preclude'undue pressure from being exerted upon the grinding wheel.

These and other objects of the invention will become apparent during the cours of the following description.

In diesel motors of the V-type present in some p y with the longitudinal dimension of the throw to be resurfaced or ground.

In the accompanying drawings, forming a part of this specification, and in which like numerals are employed to designate like parts,

Figure 1 is a fragmentary side elevation of a crankshaft showing the crankshaft grinder in Figure 2 is apartial transverse sectional view upon an enlarged scale of a crankshaftthrow and the crankshaft grinder as at line 22 of Figure 1;

2 Claims. (01. 51-241) ill) Figure 3 is a transverse sectional view upon a further enlarged scale and taken through the grinding wheel and its supporting head as at line 3-3 of Figure 1;

Figure 4 is a longitudinal vertical cross section taken through the tool mounting plat and the associated ways as at line 4-4 of Figure 2;

Figure 5 is a plan view partially in horizontal cross section as at line 55 of Figure 2; and

Figure 6 is a fragmentary perspective view of the connecting rod and cap which constitute a collar adapted to support my improved crankshaft grinder.

Referring now to Figure 6, there is shown a connecting rod in which has the usual segment of a bearing II at its lower end,'and it will be understood that the upper end is united with a piston located in a cylinder as is common to internal combustion engines. To secure the connecting rod about a throw, a cap I 2 is applied thereto by means of bolts l3 which extend upwardly through the cap and are threadedly engaged in the connecting rod H]. The connecting rod l0 together with the cap I2 encircles the throw M. A portion of the connecting rod cap I2 is routed out as at l5 and provides a tool receiving slot which has a mounting face l6 and spaced parallel walls I! on either side of the face I 6 and at right angles thereto. The slot [5 is disposed radially fromthe throw when the cap 12 is secured to connecting rod It! in encircling relation to the throw M. A positioning groove I8 is formed in the face l6 midway the Width thereof and radially extending and is adapted to receive the rib l9'which is'formed on the back face of the tool mounting plate 20. Tool mounting plate 20 is provided with a plurality of bolt receiving holes 2| which ar adapted to register with the threaded apertures 22 formed in the face I6 and which receive cap bolts 23 to secure mounting plate 20 in face to face engagement with face 16.

Since it is required that the movement of the grinding head be parallel with the axis of throw 14, it becomes necessary to supply means of adjusting the vertical tilt of plate 26. Therefore, I have supplied spaced set bolts 24 midway the width of plate 20 and spaced one above the other to bear against the bottom face of positioning set bolts 24 selectively through plate 2! and thence again tightening bolts 233Plat'e' 20- is provided with opposed rails 25 which" are V-shaped in cross section and extend vertically along the side edge faces of the plate spaced from the rear face thereof. The grinding head 26 is supported on spaced ways 21 which are disposed in parallel relation to the axis of throw l4 and are adjustably spaced therefrom by means of a supporting wall 28. The wall 28 is provided with opposed V-shaped grooves 29 and 30 which are adapted to slide over rails 25 longitudinally of plate 20. A means of eliminating play between the plate 20 and wall 28 is provided'at 3i and is common in the art.

As shown in Figures 2 and 3, ways 21 have planar top 32, bottom 33 and side faces 34 and 35. The inner side faces 34 and thetop and bottom faces 32 and 33 are finished to provide a smooth surface upon which head 26' may be supported for reciprocatingmovement longitu dinally of the ways 21. The mounting plate 20 is provided with an ear 35 which has avertically disposed internally threaded aperture 37 therein, and the supporting wall 28 is provided at its lower edge midway the width thereof with an ear 38 having a bore 35 aligned with the aperture 31 of ear 36. An adjusting bolt 49 is rotatably' carried in the ear 38 and-secured therein by means of a washer 4| and the threaded end of the bolt 40 is threadedly engaged in the aperture 31. Rotation of the bolt 40 will, therefore, shift the ways 21 vertically to selective adjusted positions relative to the throw l4. 4

With reference to Figure 3, it will be seen that head 26' is provided with a body e2 having opposed slots 43 which are slidably engaged over the ways 21 to permit longitudinal movement of the head 25 along the ways 21- The body 42 is provided 1 with a bore 44 which is aligned radially with the throw l4 and has an enlarged portion or well 45 at its upper end and a recess 46 at its lower end. A sleeve bushing. 47 is-disposed in the bore 44 and is provided at its upper end with an external flange 48 and at its lower end is threadedly engaged in a nut 49- which limits upward movement of the bushing. An expansion spring 50 is positioned in the well 45 and urges the sleeve bushing 4'! upwardly by providing expanding pressure between flange 48-and the body 42. Thus it will be seen that sleeve bushing 41 is longitudinally shiftable in bore 44 and is biased upwardly by expansion spring 59. A grinding wheel shaft 5| extends through sleeve bushing 41 and has an integral dust or grinding protector 52 at thevupper end of sleeve bushing 41, and a similar protector 52' is secured on the shaft 53 adjacent its lower end by means of nut 53 threaded thereon. The upper end of shaft 51 is provided with an axial bore 54 terminating in a reduced internally threaded socket 55 which is adapted to receive a bolt 56 provided to secure cup-shaped grinding wheel 53 to the shaft 5|. The grinding wheel 51 is provided with a; grinding face 58 at its upper end whichis positioned tangent to the surface of the throw l4.v -Suitable lubricating and packing means are applied to-the head to provide'proper lubrication-and exclude the abrasive materials used in grinding from getting into the working part of the tool.

As seen in Figure 1, the connecting rod I0 is confined on the throw bearing 14 by means of spacing wheel 59 which iscarried by the connecting rod cap I2 on a side face thereof and is adapted to bear against one of the spaced crank armsv 68 carried by mainbearingselc -It will thus'be seen-that the connectingrod H! and its cooperating cap l2 provide a collar which is adapted to consume not more than-one-ihalf of the longitudinal dimension of the throw bearing which is to be ground. It is obvious that the cap, and therefore the grinding tool, may be reversed to grind the opposed portion of the throw, and also any means of rotary power (not shown) may be applied to the grinding wheel whether it be supported by the head 26 or supplied through a flexible cable 62 as shown in Figure 1.

Referring to Figures 2 and 6, it will be seen that packing 63 is provided in a groove formed about the marginal edges of bearing segment II and cap [2 where they meet with throw bearing -.l4,- thuseliminating abrasive particles from enterin the bearing of connecting rod II].

It will be noted in Figures 1 and 3 that clamping bands 64 may be applied to one or both of the ways 21 to limit the longitudinal movement of head 26. Thus when an operator shifts the head by means of handle 65 pivotally secured to yoke 56 carried by the body 42, his movement may be restricted within the confines of the clamping bands 54. If the throw i4 is out of round, the high point ,will exert greater pressure upon the grinding face 58 of grinding wheel 5'! and spring 50 will compress, permitting shifting of the grinding wheel 51 and thus preventing breakage thereof.

Having thus described my invention, I claim:

1. A power tool for grinding the throws of an engine crankshaft while positioned in the engine comprising a connecting rod rotatably carried by said throw and confined to consume not more than one-half of its longitudinal dimension, a connecting rod cap removably secured to said rod and together with said rod encircling said throw, a tool mounting plate on said cap, spaced ways slidably mounted on said tool mounting plate and disposed in selective spaced parallel relation to said throw, an adjusting screw threadedly associating said ways and mounting plate for selective movement of said ways relative-to said throw, and a head having a powered grinding wheel rotatably supported thereby and disposed with its grinding face tangent to the surface of said throw, said head being supported for longitudinal movement along the ways and parallel with the axis of said throw I 2. The invention as defined in claim 1 wherein the head comprises a body having opposed recesses slidably engaging said ways, said head being provided with a bore having its axis disposed radially from said throw, a bushing sleeve slidable in said bore and having a flange on its upper end, a well about the upper end of said bore, an expansion spring disposed in said well and urging said flange upwardly, means on the lower end of said bushing limitin the upward movement thereof, and a grinding wheel shaft rotatably carried by said bushing and uniting said grinding wheel with its power source.

MERVIN STILES.

Number Name Date 982,367 Jordan has l- Jan. 24, 1911 1,446,982 Mauran s Feb. 27, 1923 1,902,188 Schmidt Mar. 21, 1933 1,967,744 Craft --'.c- July 2%,..1934 2,275,757 Hanson e; Mar. I10, 1942 Petersen wh ch, Mar. 24; 1942 

